Japanese Prime Minister Shinzo Abe became the first world leader to meet President-elect Donald Trump on Thursday, seeking reassurances over the future of the US-Japan security and trade relations. Abe met with Trump in New York, where the incoming president is working on setting up an administration after his surprise election victory last week that has injected new uncertainty into old US alliances.

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“I do believe that without confidence between the two nations (the) alliance would never function in the future and (after) the outcome of today’s discussion I am convinced Mr. Trump is a leader in whom I can have great confidence,” Abe said following the meeting. Trump’s campaign rhetoric caused consternation in many world capitals, including Tokyo. Trump has said he would demand that allies such as Japan and South Korea contribute more to the cost of basing U.S. troops in their countries.

Such comments have worried Japan at a time when the threat from North Korea is rising, and China is challenging the US-led security status quo in the Pacific. The State Department has said it had yet to hear from Trump’s transition team, raising the prospect of the Republican holding the meeting with Abe without any input from career diplomats with deep experience dealing with Japan.

Both Japan and South Korea already pay considerable sums to support the US bases, and note that it’s also in America’s strategic interest to deploy troops in the region. Trump has suggested that Japan and South Korea could obtain their own nuclear weapons, rather than rely on US deterrence, which risks a triggering an atomic arms races in Northeast Asia.

South Korea currently pays more than $800 million a year, about 50 percent of non-personnel costs of the US military deployment on its soil, and is paying $9.7 billion more for relocating US military bases, according to the Congressional Research Service. Japan pays about $2 billion a year, about half of the cost of the stationing US forces.

The Japanese leader may also try to sway Trump on the Trans-Pacific Partnership, a 12-country trade agreement that the president-elect opposes. The pact was championed by President Barack Obama, and Trump’s victory has all but erased hopes of its early ratification by the US Congress. The pact is expected to be discussed in a side meeting at the annual summit of the Asia Pacific Economic Community in Peru, where Abe heads after New York. Obama will also be at APEC.

Abe is Japan’s most powerful leader in a decade, and he has invested political capital in overcoming strong domestic opposition to the TPP. He has also sought to increase the international role played by Japan’s military, which is constrained by a pacifist constitution. That could jibe with Trump’s desire to see US partners shoulder more of the burden for their defense.